小学一年级加减混合

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小学一年级数学教案加减混合9篇

小学一年级数学教案加减混合9篇加减混合 1教学内容:本册教科书第75页及练习十二的第1-3题。

教学目标:1、引导学生经历从实际情境中抽象出计算数学问题的过程,直观地理解计算的意义。

2.掌握的计算顺序,能正确地进行10以内数的计算。

3·初步学习用计算解决日常生活中的一些简单实际问题,体会计算与生活的密切联系。

教具、学具准备：1. 教师准备第75页两道题及补充练习的课件。

2. 学生准备小棒、圆片等学具。

教学过程：一、复习准备先计算下面各题,然后说一说计算的顺序。

3+2+1= 5+3+2=8-2-3= 10-5-3=计算后先让学生说一说计算5+3+2和10-5-3两题时分别先算什么、再算什么,然后让他们着重说一说在5+3+2的计算中第二步是哪两个数相加,在10-5-3的计算中是哪两个数相减。

二、新课引入1、在复习题后面两道题的旁边出示如下两个算式。

5+3-2 10-5+3引导学生观察,并用复习题中的后两题和上面两题作比较, 它们有什么不同。

2·教师谈话：上面这两道题中既有加法又有减法,我们把这样的计算叫做计算,这节课就来学习这样的计算。

3. 板书课题:三、学习新知识1. 学习例1。

（1）在屏幕上出现湖里有4只天鹅,又飞来3只天鹅的场面。

教师:屏幕上反映了什么内容,你能从屏幕上提出-个什么数学问题?学生：湖里有4只天鹅,又飞来3只天鹅,可以提出"湖里一共有几只天鹅"的问题。

教师：要算湖里一共有几只天鹅怎样列式?教师根据学生的回答板书：4+3(2)屏幕上出现湖里7只天鹅飞走2只的场面.教师：湖里天鹅的只数发生了什么变化,现在还有几只天鹅?教师配合学生的回答在"4+3"的后面写“ -2”，把算式写完整：4+3-2。

教师:为什么要在4加3的后面减去2?引导学生理解:因为湖里原来有4只天鹅,飞来3只后又飞走2只,只有从原来的4只和又飞来的3只这两部分合起来的总数里减去飞走的2只,才是剩下的只数。

小学一年级数学教案加减混合的9篇

小学一年级数学教案加减混合的9篇加减混合的 1教学内容：《加减混合》这一课时是人教版〈〈义务教育课程标准实验教科书〉〉数学一年级上册第75页及练习十二的第1、2题。

教材分析：本课时在学生学习了计算10以内连加、连减的基础上学习加减混合，为今后学习2步应用题计算打下基础。

从知识结构来看，学生在学习了连加、连减后，给加减混合做了铺垫，在学习加减混合的计算顺序上不会太难，而使学生真正理解加减混合静止图片的意义存在一定的难度。

从心理特点来看，学生年龄小、活泼好动，在教学中力求激发学生学习的积极性、主动性，使学生在愉悦和谐的课堂气氛中获取新知，并培养了学生的多种能力。

从而基于对教材的理解，对教材处理如下：做成生动有趣的多媒体课件，调动学生的思维，让美妙动听的故事提高学习的兴趣，并帮助学生对图面意思的理解。

低年级学生喜欢听故事，爱玩好动，因此在教学中始终由白天鹅来牵线。

这样激发了学习兴趣，使学生在不知不觉中学会巩固所学知识。

教材安排了2个例题，他们在编排上基本相同，因此在设计上体现“教—扶—放”的原则。

例1是先加后减的混合计算，而且直观地反映了先加后减的加减混合算式的意义，还表明计算顺序。

例2先减后加，并且也是直观地反映了先减后加的加减混合算式的意义，还表明计算顺序。

并在例1的基础上，省去了计算的思考过程，让学生自己填写。

教学目标：1、引导学生经历从实际情境中抽象出加减混合计算数学问题的过程，直观地理解加减混合计算的意义。

掌握加减混合的计算顺序，能正确地进行10以内数的加减混合计算。

2、通过小组合作等方式，培养学生认真观察等良好的学习习惯，初步培养学生发现问题、提出问题、解决问题的能力，培养学生的动手操作能力与语言表达能力。

3、初步学习用加减混合计算解决日常生活中的一些简单实际问题，体会加减混合计算与生活的密切联系。

培养学生初步的应用意识和热爱数学的良好情感。

教学重难点：重点：掌握加减混合的计算顺序，能正确进行10以内数的加减混合计算。

小学一年级加减法混合运算题

小学一年级加减法混合运算练习题【导语】数学是一门基础性的科学，值得每个人去学习，尤其是孩子，更要去学习数学，并且以此来构架自己的思维体系。

学数学就是在学一种思维体系，在日常教导孩子的过程中也要注重这一点。

小学一年级加减法混合运算题篇一96-77+52= 87-26+35= 36+24-15= 88-35-13=99-45-27= 77-69+56= 28+66-77= 87-34-27=33+56-60= 76-58+39= 45-23+49= 93-67+22=100-64-32= 54+34-25= 87-62+45= 43+38-66=78-54+63= 76-48+28= 79-65+32= 97-59+21=79-65+18= 38+25-47= 69-44+28= 96-87+22=76-29+12= 45-27+54= 54+24-35= 68-35+13=89-45-17= 78-56+34= 65+29-60= 76-69+49=54-29+36= 98-67+31= 100-34-33= 54+36-67=65-62+45= 45+43-56= 78-49+61= 79-46+38=25+56-67= 89-62+45= 23+58-66= 78-69+63=77-46+28= 99-65+32= 89-34+27= 89-65+78=28+65-67= 98-64+28= 96-87+22= 77-29-32=小学一年级加减法混合运算题篇二一、口算。

45-30= 75+9= 45-22= 64+20= 81-8=二、竖式计算。

（1）46+35+17= （2）93-26-35=（3）37+49-65= （4）90-66+38=三、脱式计算。

72-（19+26）45+（40-22）100–49+26 29+31+28四、解决问题。

1、幼儿园有67名小朋友。

小丽做了24朵小花，小美做了46朵小花，每人发一朵，还剩多少多小花2、食堂里原有大米42袋，用去27袋，又买来40袋，现在有多少袋大米3、水果店运来一批苹果，上午卖出16筐，下午卖出18筐，还剩12筐。

小学一年级20以内加减混合运算练习题

小学一年级20以内加减混合运算练习题对于小学一年级的小朋友来说，掌握 20 以内的加减混合运算是数学学习中的一个重要环节。

这不仅有助于他们提高计算能力，还能培养他们的逻辑思维和专注力。

为了帮助小朋友们更好地练习 20 以内的加减混合运算，以下是一些精心设计的练习题。

一、基础练习1、 3 ＋ 5 2 ＝小朋友们，先算 3 ＋ 5 ＝ 8，再算 8 2 ＝ 6。

2、 9 4 ＋ 3 ＝先算 9 4 ＝ 5，再算 5 ＋ 3 ＝ 8。

3、 7 ＋ 2 5 ＝7 ＋ 2 等于 9，9 5 等于 4。

二、逐步增加难度1、 8 ＋ 3 7 ＋ 2 ＝我们可以先算 8 ＋ 3 ＝ 11，11 7 ＝ 4，4 ＋ 2 ＝ 6 。

2、 6 2 ＋ 5 3 ＝先算 6 2 ＝ 4，4 ＋ 5 ＝ 9，9 3 ＝ 6 。

3、 4 ＋ 7 3 ＋ 1 ＝4 ＋ 7 是 11，11 3 等于 8，8 ＋ 1 等于 9 。

三、实际应用1、小明有 5 个苹果，妈妈又给了他 3 个，小明吃了 2 个，请问小明现在还有几个苹果？算式是：5 ＋ 3 2 ＝ 6（个）2、花园里有 7 朵红花，3 朵黄花，后来又开了 2 朵红花，凋谢了 1 朵黄花，现在花园里一共有多少朵花？7 ＋ 3 ＋ 2 1 ＝ 11（朵）四、有趣的填空练习1、（） 3 ＋ 4 ＝ 6先算 4 3 ＝ 1，所以（ 5 ） 3 ＋ 4 ＝ 6 。

2、 2 ＋（） 5 ＝ 4先算 2 5 ＝－3，所以 2 ＋（ 7 ） 5 ＝ 4 。

3、 8 （）＋ 2 ＝ 58 ＋ 2 ＝ 10，10 （ 5 ）＝ 5 。

五、易错提醒在做 20 以内加减混合运算时，小朋友们要注意以下几点：1、要按照从左到右的顺序依次计算。

2、计算时要认真，不要粗心大意，比如加法做错成减法，或者计算结果出错。

小朋友们，只要多练习，你们一定能够熟练掌握 20 以内的加减混合运算！加油哦！希望这些练习题能够帮助一年级的小朋友们在数学学习的道路上迈出坚实的一步，让他们在轻松愉快的氛围中提高自己的计算能力和数学思维。

小学一年级加减法混合运算练习题

学数学就是在学一种思维体系，在日常教导孩子的过程中也要注重这一点。

小学一年级加减法混合运算题篇一96-77+52=87-26+35=36+24-15=88-35-13=99-45-27=77-69+56=28+66-77=87-34-27=33+56-60=76-58+39=45-23+49=93-67+22=100-64-32=54+34-25=87-62+45=43+38-66=78-54+63=76-48+28=79-65+32=97-59+21=79-65+18=38+25-47=69-44+28=96-87+22=76-29+12=45-27+54=54+24-35=68-35+13=89-45-17=78-56+34=65+29-60=76-69+49=54-29+36=98-67+31=100-34-33=54+36-67=65-62+45=45+43-56=78-49+61=79-46+38=25+56-67=89-62+45=23+58-66=78-69+63=77-46+28=99-65+32=89-34+27=89-65+78=28+65-67=98-64+28=96-87+22=77-29-32=小学一年级加减法混合运算题篇二一、口算。

45-30=75+9=45-22=64+20=81-8=二、竖式计算。

（1）46+35+17=（2）93-26-35=（3）37+49-65=（4）90-66+38=三、脱式计算。

72-（19+26）45+（40-22）100–49+2629+31+28四、解决问题。

1、幼儿园有67名小朋友。

小丽做了24朵小花，小美做了46朵小花，每人发一朵，还剩多少多小花？2、食堂里原有大米42袋，用去27袋，又买来40袋，现在有多少袋大米？3、水果店运来一批苹果，上午卖出16筐，下午卖出18筐，还剩12筐。

人教版小学数学一年级加减混合口算题卡(带括号)

人教版小学数学一年级加减混合口算题卡
(带括号)
说明
本文档为人教版小学数学一年级的加减混合口算题卡，题目中包含了括号的运算。

这些题目旨在帮助一年级的学生巩固加减法的概念和运算技巧。

题目列表
以下是一些示例题目，供学生练：
1. 括号中加法
计算以下算式的结果：
1) 2 + (3 + 4)
2) (5 + 6) + 7
3) 8 + (9 + 10)
2. 括号中减法
计算以下算式的结果：
1) 10 - (5 - 3)
2) (8 - 2) - 4
3) 6 - (7 - 1)
3. 混合运算
计算以下算式的结果：
1) 4 + (6 - 2)
2) (9 - 3) + 5
3) (1 + 2) - 3
4. 嵌套括号
计算以下算式的结果：
1) (2 + (3 - 1)) + 4
2) (5 - (2 + 1)) - 3
3) (6 - (4 - 2)) + 5
5. 括号位置调整
计算以下算式的结果：
1) 2 + ((3 + 4) - 1)
2) ((5 - 2) + 3) - 4
3) (5 - (1 - 2)) + 3
使用提示
- 在计算算式时，请按照括号内的运算优先进行计算。

- 如果有多对括号，请从最内部的括号开始计算。

以上是人教版小学数学一年级加减混合口算题卡的内容。

学生们可以针对这些题目进行训练，以提高他们的口算能力和数学运算技巧。

小学一年级上册数学《加减混合》教案

小学一年级上册数学《加减混合》教案教学是一种创造性劳动。

写一份优秀教案是设计者教育思想、智慧、动机、经验、个性和教学艺术性的综合体现,那么具体应该如何写呢下面是小编给大家整理的小学一年级上册数学《加减混合》教案5篇，希望对大家能有所帮助!小学一年级上册数学《加减混合》教案1教学目的：1、要求学生理解加减混合运算统一为加法运算的意义。

2、能初步掌握有关有理数的加减混合运算。

教学分析：重点：如何更准确地把加减混合运算统一成加法。

难点：将一个加减混合运算式写成省略加号的和的形式。

教学过程：一、知识导向：本节是在对前面所学的有理数的加法运算法则及减法运算法则的综合运用，所以必须对有关法则有更深层次的认识，并能在运算中加以灵活运用。

二、新课：1、知识基础：其一：有理数的加法法则;其二：有理数的减法法则。

其三：“+”、“—”在不同情形的意义(运算符号及性质符号)2、知识形成：(引例)计算：根据减法法则，按照运算顺序，有：原式在一个加式里，通常把各个加数的括号和它前面的加号省略不写，即有：这个式子仍看作和式，有两种读法，按性质符号：读作“负8、正10、负6、负4的和”按运算意义：读作“负8加上10减去6减去4”例：把写成省略加号的和的形式，并把它读出来(两种读法)。

例：按运算顺序直接计算：三、巩固训练：P46：1、2四、知识小结：本节课所涉及到的新知识点比较少，但在其中就特别注意的是，如何保证学生在省略特号时，能尽量减少错误的出现，并能对省略加号的算式的准确读法。

五、家庭作业：P47：1、23六、每日预题：如何结合本节课所学习的内容对有关有理数的加减混合运算进行简化运算小学一年级上册数学《加减混合》教案2【教学目标】1、认识加、减混合运算式题，掌握加、减混合运算式题的运算顺序，能正确计算加、减混合式题。

2、能看图列出加、减混合算式。

3、培养学生观察、比较和抽象概括能力，以及应用所学知识解决实际问题的能力。

4、培养学生认真做题，计算正确、书写整洁的良好习惯。

小学一年级100以内加减混合(3连加减)口算题

91 + 6 + 1 = 77 - 51 - 11 = 9 - 9 + 30 = 41 + 33 - 61 = 60 - 49 - 8 = 13 + 30 + 13 = 29 + 32 - 34 = 41 + 41 + 9 = 9 + 62 + 28 = 33 + 46 - 34 = 20 - 9 - 8 = 11 - 8 + 92 = 39 + 38 - 28 = 21 + 71 - 23 = 85 + 10 + 5 = 50 + 46 - 93 = 50 - 9 - 35 = 38 + 14 + 42 = 8 + 72 + 19 = 93 + 7 - 49 = 20 + 43 - 21 = 25 - 8 + 18 = 19 + 39 + 20 = 73 + 20 + 6 = 62 - 49 + 68 = 45 - 20 + 65 = 74 - 54 + 76 = 11 + 34 - 45 = 70 + 16 + 14 = 47 - 40 + 84 =63 + 35 - 78 = 43 + 33 + 17 = 70 + 24 - 28 = 63 - 60 - 1 = 55 - 47 + 82 =64 + 14 - 32 = 45 + 10 - 32 = 17 - 12 + 36 = 37 - 13 - 16 = 67 + 17 + 8 = 41 - 34 - 7 = 8 + 44 + 36 = 44 + 23 + 32 = 23 - 16 + 22 = 77 - 11 - 8 = 55 + 29 - 22 = 79 - 73 - 3 = 91 + 7 + 1 = 75 - 26 + 10 = 47 - 24 + 27 = 92 + 8 - 44 = 22 + 67 - 73 = 93 - 51 - 18 = 17 - 6 + 13 = 66 + 16 - 78 = 85 + 6 + 9 = 32 + 65 + 2 = 22 - 6 - 11 = 44 - 9 + 60 = 37 + 45 + 8 = 77 + 23 - 15 = 78 - 30 - 33 = 17 + 83 - 16 = 92 + 6 - 56 = 39 + 39 + 22 = 25 + 68 + 7 = 30 + 58 + 8 = 91 - 72 - 16 = 83 - 69 + 75 = 17 - 6 + 48 = 54 - 33 - 17 = 27 - 9 + 58 = 70 - 28 - 26 = 86 - 27 - 26 = 21 + 12 - 17 = 65 - 29 + 41 = 56 - 33 - 14 = 36 + 10 + 28 = 61 + 18 - 56 = 41 + 45 - 53 = 共计：80 题做对：计时：成绩：171 + 24 - 13 = 76 + 8 - 76 = 31 + 20 - 43 = 70 - 45 - 8 = 36 + 42 - 65 = 47 - 46 + 81 = 12 + 82 - 70 = 11 + 35 + 25 = 88 - 37 + 6 = 79 - 17 - 38 = 83 - 81 + 58 = 28 - 26 + 19 = 81 + 17 - 75 = 23 - 11 + 64 = 28 + 25 - 11 = 58 + 36 - 80 = 37 + 20 + 10 = 12 - 10 + 88 = 44 + 20 + 32 = 47 - 38 + 70 = 24 + 58 - 81 = 47 + 51 - 77 = 89 + 11 - 83 = 26 - 24 + 38 = 60 + 6 + 7 = 53 - 12 - 27 = 56 - 42 - 10 = 9 + 18 - 25 = 82 + 6 + 7 = 48 - 34 - 10 = 11 + 35 + 25 = 39 + 12 + 29 = 37 - 12 + 72 = 20 - 10 - 6 = 36 - 20 + 64 = 11 + 39 + 9 = 48 - 37 + 82 = 16 - 7 + 14 = 63 - 33 + 63 = 93 + 6 + 1 = 92 + 8 - 96 = 87 + 8 - 65 = 14 + 60 - 18 = 92 + 7 + 1 = 83 - 42 - 37 = 88 - 18 - 66 = 87 - 34 - 43 = 35 + 39 + 18 = 8 + 42 - 50 = 61 - 46 + 43 = 78 + 11 + 9 = 20 - 10 - 6 = 24 - 7 + 57 = 83 - 62 - 14 = 58 + 17 + 22 = 36 + 32 - 17 = 24 + 35 - 26 = 62 - 50 - 10 = 58 + 13 - 22 = 77 + 16 + 7 = 61 - 30 + 10 = 56 + 37 + 6 = 91 - 30 - 50 = 24 - 19 + 16 = 90 - 47 + 39 = 51 + 12 - 60 = 56 + 30 - 41 = 78 - 37 + 58 = 45 + 12 - 23 = 46 + 38 - 50 = 76 + 9 + 8 = 59 - 48 + 15 = 54 + 14 + 26 = 22 + 16 + 29 = 69 - 68 - 1 = 8 - 6 - 1 = 33 + 6 + 37 = 33 - 28 - 1 = 73 + 13 - 79 = 73 - 16 - 25 = 共计：80 题做对：计时：成绩：221 - 21 + 21 = 35 + 58 - 31 = 24 - 17 - 7 = 46 + 50 - 14 = 15 + 62 + 11 = 18 + 25 + 57 = 87 + 10 - 95 = 18 - 7 + 63 = 43 + 20 + 12 = 48 + 10 - 17 = 45 + 38 - 74 = 51 + 26 + 15 = 56 + 33 - 69 = 90 + 8 + 2 = 74 - 55 - 6 = 48 - 15 - 28 = 29 - 11 + 71 = 35 + 31 + 31 = 15 - 6 - 8 = 65 - 29 - 32 = 70 - 47 - 21 = 69 - 68 - 1 = 49 + 21 + 29 = 85 - 12 - 14 = 63 + 13 - 35 = 79 + 9 + 9 = 43 - 12 + 27 = 69 + 9 - 55 = 73 - 73 + 76 = 73 - 73 + 54 = 76 + 12 + 11 = 77 - 17 + 18 = 49 + 26 - 58 = 32 + 22 + 41 = 26 - 8 - 9 = 29 - 21 + 52 = 45 + 11 - 49 = 54 + 9 - 38 = 30 + 37 + 33 = 14 + 40 - 35 = 33 - 22 - 6 = 29 - 7 + 26 = 58 - 35 + 10 = 71 + 27 - 57 = 20 - 10 + 20 = 14 + 50 + 9 = 74 + 12 - 51 = 66 + 28 + 2 = 28 - 16 + 75 = 8 - 6 + 28 = 75 + 15 + 7 = 93 + 6 - 20 = 19 - 8 - 6 = 80 - 8 - 59 = 8 + 19 + 20 = 42 + 21 - 39 = 47 - 30 + 78 = 70 + 23 + 6 = 20 + 70 - 34 = 52 + 24 - 19 = 33 - 21 - 8 = 25 + 43 - 41 = 37 + 7 + 28 = 51 + 46 + 3 = 50 + 42 - 77 = 16 + 10 - 6 = 82 - 45 - 10 = 38 - 22 + 50 = 89 - 44 + 51 = 59 + 8 - 12 = 61 + 8 - 47 = 72 - 26 - 18 = 37 + 18 + 24 = 44 + 46 - 63 = 44 + 40 + 13 = 47 - 47 + 57 = 58 + 6 + 35 = 21 + 7 - 13 = 13 + 19 - 30 = 88 - 13 + 22 = 共计：80 题做对：计时：成绩：366 + 34 - 73 = 48 + 52 - 16 = 12 - 11 - 1 = 41 - 20 - 8 = 31 - 14 - 11 = 16 + 52 - 26 = 74 - 36 - 35 = 82 - 9 - 12 = 44 + 56 - 21 = 83 - 42 + 55 = 59 + 41 - 68 = 86 - 72 + 69 = 54 - 19 + 6 = 85 - 30 - 23 = 55 - 29 + 72 = 14 + 67 - 79 = 93 - 15 - 13 = 77 + 17 + 4 = 34 + 23 - 35 = 36 + 40 + 9 = 14 - 7 + 37 = 21 + 23 + 19 = 26 + 27 - 15 = 58 + 27 - 70 = 39 + 51 - 45 = 57 - 34 - 10 = 20 - 15 + 8 = 37 + 28 + 29 = 79 - 46 + 28 = 35 - 11 + 6 = 88 + 12 - 39 = 62 - 15 - 24 = 88 - 46 - 26 = 80 - 75 - 2 = 51 + 25 - 59 = 20 - 7 - 7 = 90 - 29 - 34 = 67 + 23 - 55 = 15 + 46 - 33 = 71 + 16 + 10 = 25 + 8 + 13 = 83 - 56 + 11 = 54 - 29 + 68 = 85 + 9 - 70 = 8 - 7 + 66 = 43 + 12 + 31 = 70 - 15 - 26 = 89 - 75 - 13 = 16 + 56 - 7 = 59 + 8 + 16 = 91 + 6 + 3 = 57 + 16 + 25 = 38 - 7 + 44 = 54 - 39 + 12 = 25 + 32 + 32 = 12 + 54 + 28 = 22 + 46 + 31 = 32 - 20 + 49 = 35 + 57 - 78 = 39 - 7 - 18 = 33 + 16 - 27 = 18 + 38 + 11 = 68 + 14 - 49 = 24 + 8 - 28 = 66 + 22 + 7 = 69 + 15 - 23 = 37 + 35 - 26 = 30 + 44 + 18 = 45 - 9 + 61 = 43 + 47 - 24 = 42 - 8 - 17 = 74 - 9 - 51 = 27 + 62 + 9 = 24 - 6 - 16 = 84 - 24 - 49 = 19 + 25 + 25 = 21 + 32 + 36 = 91 - 83 - 8 = 15 - 13 + 85 = 47 - 10 - 21 = 共计：80 题做对：计时：成绩：490 + 8 - 19 = 82 - 59 - 11 = 64 + 32 + 4 = 38 - 29 + 25 = 28 - 23 + 22 = 54 + 46 - 91 = 77 - 24 - 40 = 8 + 84 + 7 = 74 + 11 - 26 = 86 - 31 + 27 = 93 + 6 + 1 = 26 - 7 + 23 = 14 - 12 + 96 = 53 - 12 + 35 = 59 + 33 + 8 = 71 + 26 - 93 = 18 - 18 + 24 = 31 + 10 + 44 = 84 + 8 - 27 = 78 - 72 + 91 = 27 + 12 + 41 = 13 - 7 - 3 = 8 - 6 + 30 = 70 + 14 + 16 = 58 + 40 - 57 = 44 - 34 + 69 = 12 - 8 + 18 = 38 - 27 + 83 = 68 + 15 - 71 = 54 + 6 + 38 = 81 - 79 - 1 = 76 + 13 + 6 = 13 + 78 - 74 = 18 - 7 - 6 = 15 - 15 + 14 = 36 - 16 + 26 = 83 - 50 + 66 = 64 - 49 + 19 = 14 + 78 - 10 = 93 - 38 + 33 = 70 + 28 - 85 = 28 + 8 + 47 = 59 + 26 + 9 = 27 - 21 - 2 = 48 - 23 - 7 = 54 - 14 - 32 = 28 + 25 - 28 = 66 - 17 - 16 = 57 + 39 - 44 = 65 - 39 + 66 = 67 - 50 + 35 = 82 - 39 - 17 = 80 - 39 - 34 = 28 - 9 + 13 = 56 - 16 + 31 = 89 + 7 - 33 = 57 + 22 + 7 = 23 + 21 - 22 = 67 + 14 + 17 = 77 - 75 + 45 = 88 + 6 + 3 = 63 + 13 - 40 = 38 - 37 - 1 = 64 + 11 - 74 = 25 + 39 - 19 = 9 + 22 + 63 = 15 - 7 - 8 = 74 - 14 - 31 = 70 + 8 - 9 = 19 - 10 + 83 = 35 - 34 + 27 = 64 + 16 - 17 = 93 + 7 - 78 = 80 + 16 + 3 = 37 + 29 + 32 = 59 - 7 - 20 = 8 + 90 + 1 = 77 + 14 + 6 = 32 - 10 - 13 = 9 - 9 + 84 = 共计：80 题做对：计时：成绩：587 + 11 - 42 = 66 - 21 + 48 = 91 + 9 - 78 = 22 - 12 + 28 = 16 + 79 - 42 = 12 - 10 - 2 = 43 + 12 - 24 = 51 - 35 - 16 = 18 - 16 - 1 = 74 - 29 - 10 = 33 - 30 + 73 = 90 - 33 - 31 = 60 + 18 + 14 = 61 + 7 + 9 = 40 - 34 + 81 = 45 - 8 - 17 = 55 - 40 + 83 = 87 + 10 + 2 = 53 + 6 - 19 = 69 + 15 - 71 = 93 - 47 - 38 = 89 + 9 - 59 = 37 - 17 + 27 = 32 + 66 + 1 = 68 - 51 - 7 = 27 + 17 + 42 = 63 - 59 - 3 = 36 - 33 + 47 = 42 + 55 - 43 = 34 - 12 + 17 = 93 + 6 - 31 = 12 - 9 + 89 = 86 + 8 - 78 = 9 + 64 + 6 = 53 + 8 + 29 = 53 + 35 + 6 = 61 - 7 - 28 = 44 + 34 - 64 = 42 + 7 - 45 = 82 - 48 + 19 = 69 - 46 + 74 = 18 + 39 - 36 = 81 + 7 + 11 = 21 + 25 - 32 = 15 - 12 + 85 = 91 - 53 - 24 = 8 + 39 - 45 = 51 - 6 - 8 = 56 + 15 - 63 = 81 - 10 + 22 = 45 + 32 + 23 = 86 - 73 + 78 = 80 - 18 + 27 = 36 - 34 - 1 = 61 + 15 - 76 = 89 + 8 + 1 = 46 + 18 - 53 = 91 - 18 - 23 = 90 - 34 + 20 = 30 - 22 + 57 = 92 - 79 + 6 = 72 + 11 - 47 = 51 + 25 - 41 = 87 + 11 + 2 = 46 + 8 + 41 = 85 - 27 - 45 = 70 - 12 - 33 = 10 - 6 - 2 = 81 - 12 + 28 = 68 - 54 + 82 = 28 - 10 + 78 = 41 - 23 - 8 = 15 - 12 + 67 = 72 + 10 + 18 = 35 - 32 + 61 = 10 - 6 + 90 = 12 + 25 + 40 = 64 + 6 + 30 = 84 + 11 - 28 = 20 - 9 - 7 = 共计：80 题做对：计时：成绩：661 - 30 + 66 = 57 - 29 - 8 = 64 + 24 - 76 = 36 + 33 + 16 = 78 + 16 + 5 = 15 + 22 + 35 = 31 + 64 - 35 = 44 - 10 + 39 = 85 + 12 + 1 = 61 + 32 + 6 = 57 + 8 - 29 = 80 - 39 - 12 = 16 + 41 - 8 = 18 - 16 - 1 = 76 - 67 - 6 = 8 + 87 - 89 = 28 - 15 + 31 = 9 - 6 - 2 = 55 + 35 + 8 = 84 - 75 - 9 = 80 + 13 - 52 = 24 + 29 + 12 = 38 + 31 + 21 = 71 + 23 - 90 = 73 - 10 - 61 = 19 - 17 - 2 = 13 + 71 + 14 = 83 + 14 + 2 = 61 + 13 - 10 = 62 + 19 - 40 = 83 + 12 - 42 = 58 - 32 - 7 = 34 - 31 - 3 = 39 + 19 - 47 = 46 + 17 + 16 = 92 - 35 + 40 = 12 + 57 - 33 = 44 + 50 + 3 = 55 + 18 - 12 = 89 + 11 - 24 = 17 + 56 + 6 = 27 - 22 + 43 = 73 + 6 + 17 = 22 + 74 + 4 = 21 - 15 - 5 = 49 + 7 - 33 = 71 + 28 - 54 = 68 + 31 - 19 = 16 + 8 + 16 = 74 - 40 - 21 = 70 + 28 - 83 = 73 + 6 - 25 = 76 + 15 - 58 = 14 - 11 + 65 = 69 - 37 - 30 = 62 + 31 - 77 = 16 + 41 + 28 = 72 + 8 - 32 = 79 - 78 - 1 = 18 + 37 - 9 = 50 - 27 + 22 = 81 - 21 - 21 = 64 + 33 - 9 = 40 + 30 + 7 = 43 - 17 + 9 = 90 - 89 - 1 = 72 - 65 + 36 = 27 - 15 - 8 = 10 + 15 + 29 = 43 - 23 + 72 = 73 + 13 + 10 = 74 + 26 - 84 = 77 - 62 - 9 = 44 + 29 - 21 = 88 - 78 - 9 = 76 + 21 + 3 = 68 + 15 - 52 = 56 + 21 - 7 = 65 - 21 + 8 = 39 + 6 - 22 = 共计：80 题做对：计时：成绩：760 - 28 - 25 = 77 - 75 + 72 = 64 - 25 - 24 = 80 - 67 - 10 = 62 + 14 - 37 = 13 + 57 + 13 = 38 - 24 + 81 = 60 - 35 - 13 = 56 - 37 + 31 = 60 - 8 - 31 = 52 - 17 + 25 = 55 - 27 - 22 = 66 + 25 - 23 = 13 + 22 - 22 = 56 - 8 - 12 = 9 + 69 - 21 = 31 - 29 + 14 = 21 + 56 + 23 = 19 + 36 - 24 = 66 + 14 + 20 = 90 - 7 - 72 = 25 - 17 + 30 = 90 + 7 - 71 = 28 - 26 + 6 = 58 + 29 - 80 = 79 - 14 - 35 = 82 - 47 - 9 = 73 - 6 - 17 = 82 + 15 - 25 = 62 + 21 - 52 = 11 + 54 - 60 = 50 + 42 + 7 = 62 + 29 + 7 = 14 + 8 - 10 = 90 + 7 - 53 = 8 + 32 - 24 = 68 - 54 - 12 = 50 - 34 - 11 = 19 - 15 - 3 = 44 + 31 + 11 = 84 - 73 + 67 = 37 + 43 - 25 = 84 - 66 - 13 = 91 + 7 + 2 = 10 + 49 - 34 = 53 + 19 - 27 = 21 + 75 + 1 = 9 - 8 - 1 = 35 + 15 - 16 = 54 + 14 - 28 = 15 - 12 + 6 = 63 - 30 + 38 = 29 + 41 + 22 = 80 + 16 + 3 = 32 + 40 + 27 = 73 - 23 - 9 = 62 - 56 + 65 = 22 + 11 - 23 = 66 - 11 + 12 = 52 + 12 - 63 = 40 - 15 - 17 = 71 - 49 + 21 = 26 + 58 - 65 = 64 - 44 + 59 = 50 - 11 + 20 = 86 - 82 + 85 = 82 - 27 - 39 = 14 + 28 - 30 = 12 - 6 - 3 = 88 + 8 + 3 = 26 + 32 - 50 = 69 + 6 - 64 = 68 - 50 + 7 = 41 - 16 + 54 = 11 - 9 - 2 = 67 + 25 - 28 = 85 + 9 - 88 = 59 - 31 - 20 = 91 + 7 + 2 = 33 + 36 - 58 = 共计：80 题做对：计时：成绩：835 - 9 - 21 = 68 - 68 + 19 = 73 + 15 + 6 = 61 + 32 + 6 = 39 + 26 + 23 = 33 - 13 - 16 = 59 + 6 + 35 = 64 - 23 - 22 = 51 - 17 + 7 = 84 + 6 - 43 = 18 + 40 + 42 = 34 + 47 - 67 = 63 + 26 - 37 = 38 + 27 + 25 = 38 + 49 - 40 = 50 - 9 - 40 = 31 + 68 - 53 = 82 - 60 + 56 = 88 + 8 - 66 = 90 + 6 + 1 = 28 + 10 - 17 = 56 - 11 - 21 = 74 - 72 + 82 = 17 + 68 + 11 = 33 + 18 - 39 = 82 + 10 - 38 = 10 + 40 - 6 = 8 + 78 - 71 = 78 + 17 - 70 = 72 + 17 - 32 = 10 - 8 - 2 = 47 + 24 + 9 = 86 + 10 - 56 = 26 + 42 + 30 = 28 + 57 + 10 = 20 + 15 + 19 = 36 - 16 + 20 = 44 + 17 - 47 = 64 + 16 + 10 = 66 + 14 - 39 = 39 + 16 - 27 = 10 + 25 - 27 = 9 + 23 + 41 = 45 + 50 - 57 = 30 + 30 - 35 = 74 - 35 + 7 = 39 - 38 + 30 = 8 + 6 - 11 = 29 + 23 - 25 = 71 - 27 - 6 = 67 - 10 + 17 = 84 + 14 - 8 = 11 - 7 - 3 = 77 + 12 - 44 = 34 - 6 + 25 = 76 + 17 + 6 = 83 + 17 - 15 = 57 - 23 - 7 = 50 - 40 + 17 = 9 - 6 + 18 = 35 + 51 - 42 = 12 + 16 + 59 = 21 + 9 + 61 = 35 + 8 - 8 = 11 + 54 + 21 = 79 - 18 - 28 = 68 + 25 - 59 = 73 + 7 - 15 = 92 + 6 + 2 = 79 + 20 - 94 = 68 + 16 + 8 = 11 + 85 + 2 = 45 + 21 - 14 = 53 - 28 - 12 = 30 - 26 + 65 = 8 + 38 - 46 = 15 + 6 + 7 = 47 - 44 - 2 = 86 - 12 - 23 = 80 + 15 - 17 = 共计：80 题做对：计时：成绩：993 + 7 - 71 = 68 - 27 + 15 = 58 - 42 - 16 = 64 + 19 - 76 = 47 + 21 - 19 = 70 - 33 + 6 = 82 - 75 + 59 = 13 + 80 + 6 = 68 - 20 - 7 = 18 - 17 - 1 = 45 - 23 + 57 = 16 + 63 - 16 = 74 - 40 - 25 = 28 - 7 + 10 = 51 + 32 + 7 = 65 + 34 - 84 = 66 - 13 - 47 = 73 - 40 + 17 = 15 - 12 + 15 = 17 - 13 + 11 = 53 + 45 - 89 = 71 + 6 + 17 = 65 + 33 + 1 = 42 + 51 + 6 = 45 + 14 + 33 = 75 + 9 - 38 = 78 - 22 - 28 = 40 + 35 - 57 = 54 - 49 + 20 = 69 - 58 + 28 = 10 + 22 - 28 = 57 + 29 + 13 = 26 - 13 + 63 = 65 + 24 + 6 = 54 + 38 + 7 = 54 - 19 + 34 = 16 + 13 - 23 = 66 + 9 + 19 = 10 - 6 - 2 = 61 + 38 + 1 = 60 - 21 + 11 = 13 + 30 - 24 = 85 + 10 - 94 = 9 + 37 + 40 = 61 - 7 + 43 = 52 + 37 + 10 = 35 - 31 + 30 = 51 - 29 - 15 = 14 - 10 - 4 = 79 - 14 + 32 = 89 + 6 + 1 = 70 + 23 - 29 = 44 - 42 + 15 = 11 - 7 - 3 = 28 + 54 - 38 = 56 - 7 + 9 = 75 - 42 - 30 = 70 + 10 + 16 = 57 + 31 + 8 = 21 - 6 + 17 = 24 - 23 + 59 = 78 - 37 + 59 = 26 + 67 - 60 = 38 + 54 - 19 = 51 + 33 + 11 = 49 + 22 - 18 = 75 + 20 + 5 = 36 + 39 - 34 = 47 + 38 + 14 = 19 + 52 - 12 = 58 - 22 + 47 = 70 - 43 - 21 = 34 - 28 - 3 = 24 - 11 - 11 = 62 - 9 - 37 = 64 + 22 + 9 = 81 - 8 + 8 = 60 - 22 - 19 = 21 + 49 + 21 = 78 - 45 - 10 = 共计：80 题做对：计时：成绩：1066 + 12 + 8 = 35 + 50 - 47 = 41 + 48 - 48 = 28 + 33 - 18 = 8 + 59 + 20 = 46 - 20 - 26 = 44 - 35 + 53 = 20 + 39 + 18 = 75 - 9 + 16 = 64 + 21 + 15 = 11 - 10 - 1 = 42 - 26 - 9 = 21 - 15 + 17 = 10 + 60 + 6 = 43 + 55 - 48 = 27 + 67 + 2 = 27 - 10 + 48 = 29 - 24 + 54 = 62 + 10 - 37 = 25 + 40 - 24 = 87 + 7 - 75 = 34 - 8 - 20 = 86 + 11 - 76 = 37 - 9 - 10 = 64 - 46 + 65 = 89 - 61 - 14 = 80 - 74 - 4 = 41 + 17 + 14 = 69 - 10 - 23 = 79 + 15 - 73 = 93 + 6 - 79 = 35 + 8 - 34 = 8 + 89 - 61 = 38 + 15 - 29 = 23 - 12 - 9 = 25 + 37 + 27 = 49 + 24 - 72 = 43 - 22 - 8 = 53 - 24 + 68 = 28 - 13 + 9 = 51 + 41 + 7 = 10 - 6 + 36 = 65 - 61 + 71 = 87 + 8 + 5 = 77 - 33 + 11 = 24 + 71 - 52 = 84 + 7 + 9 = 56 + 11 + 24 = 33 - 30 + 68 = 66 + 17 + 17 = 72 + 6 + 14 = 44 + 17 + 10 = 56 + 41 - 48 = 79 - 39 - 28 = 32 - 20 + 56 = 91 - 62 + 10 = 42 + 33 - 35 = 65 - 26 - 13 = 85 + 9 + 2 = 24 - 9 - 15 = 61 + 12 - 31 = 58 - 56 - 1 = 88 - 20 + 20 = 20 - 19 - 1 = 9 + 84 + 6 = 77 - 65 - 11 = 49 - 37 + 59 = 88 + 6 - 68 = 78 - 47 - 19 = 74 - 12 + 26 = 38 - 17 + 21 = 56 - 9 - 36 = 82 - 73 - 6 = 34 - 11 - 11 = 31 + 16 - 18 = 54 - 26 + 56 = 18 + 50 - 34 = 48 - 33 - 15 = 26 - 21 - 3 = 85 + 15 - 59 = 共计：80 题做对：计时：成绩：1143 - 17 - 22 = 27 - 22 + 78 = 81 - 66 - 15 = 47 - 15 - 28 = 75 - 52 + 67 = 53 + 6 - 10 = 22 + 23 - 25 = 78 - 51 - 20 = 68 + 17 - 75 = 76 + 21 + 2 = 33 - 20 + 69 = 23 + 24 + 31 = 78 - 66 - 12 = 25 - 13 - 9 = 36 + 9 - 25 = 18 - 10 + 87 = 34 - 11 + 25 = 91 - 16 + 15 = 43 - 23 - 8 = 53 + 10 - 43 = 92 - 88 + 53 = 25 + 46 + 25 = 48 - 37 - 7 = 51 - 36 + 13 = 53 + 28 - 20 = 83 + 11 - 20 = 26 - 10 + 55 = 21 - 14 + 35 = 67 + 31 - 57 = 70 - 14 - 18 = 53 - 21 - 13 = 41 - 28 - 9 = 63 + 23 - 27 = 16 - 11 - 2 = 81 + 8 + 10 = 45 - 27 - 9 = 56 + 18 + 13 = 92 - 26 - 30 = 36 - 18 - 9 = 18 - 10 + 55 = 75 + 19 - 6 = 11 + 83 - 24 = 85 + 8 + 6 = 65 - 42 + 46 = 82 + 6 + 7 = 60 - 42 - 13 = 30 - 20 - 10 = 51 + 9 + 28 = 17 + 8 + 42 = 47 + 20 + 17 = 44 - 13 - 17 = 57 - 25 - 28 = 56 - 38 - 11 = 48 + 37 - 66 = 15 + 73 - 48 = 53 - 16 + 14 = 20 - 12 + 80 = 79 - 48 - 8 = 82 - 51 - 11 = 11 + 32 - 13 = 68 + 32 - 97 = 71 - 40 - 27 = 49 - 39 + 61 = 90 + 7 - 72 = 29 - 12 + 13 = 76 + 7 + 17 = 66 + 33 + 1 = 65 - 14 + 33 = 28 + 41 + 10 = 77 - 46 - 17 = 83 + 11 + 3 = 22 + 61 + 11 = 72 + 23 - 25 = 60 - 49 + 8 = 53 + 7 - 46 = 18 + 32 - 26 = 15 - 13 - 2 = 33 - 24 + 64 = 69 - 22 + 51 = 71 - 16 - 43 = 共计：80 题做对：计时：成绩：1229 - 23 + 89 = 59 - 10 - 45 = 91 - 31 - 32 = 61 - 45 - 12 = 39 - 28 + 76 = 59 + 9 - 63 = 47 + 40 + 8 = 81 - 57 + 57 = 39 - 23 - 10 = 54 + 10 + 22 = 88 - 37 - 23 = 25 + 33 - 39 = 69 - 31 + 36 = 48 - 48 + 51 = 37 + 25 - 35 = 34 - 28 + 21 = 24 + 74 - 46 = 93 + 7 - 7 = 13 - 9 + 37 = 27 + 56 - 50 = 59 + 10 - 52 = 82 - 46 + 52 = 66 - 34 + 19 = 48 - 7 - 36 = 17 + 61 + 15 = 73 - 23 - 40 = 41 + 29 + 30 = 42 + 40 - 26 = 36 - 16 - 14 = 60 - 19 + 57 = 25 + 66 - 79 = 78 + 21 + 1 = 60 - 53 + 15 = 80 + 16 + 3 = 69 - 34 + 56 = 88 - 42 - 37 = 84 - 23 + 39 = 74 - 18 - 9 = 40 + 44 + 15 = 46 - 21 - 8 = 33 + 21 - 38 = 66 + 29 + 2 = 38 + 12 - 48 = 10 + 79 - 7 = 86 + 10 + 4 = 15 + 49 - 51 = 76 - 61 - 15 = 59 + 19 + 16 = 73 - 38 - 24 = 57 - 33 + 28 = 10 - 9 - 1 = 54 + 31 + 11 = 31 + 15 + 36 = 26 - 10 - 15 = 91 + 7 + 1 =68 + 28 + 1 = 80 - 63 + 55 = 8 - 6 + 9 = 87 + 6 - 86 = 37 + 20 - 37 =69 + 23 - 6 = 83 + 13 - 52 = 55 + 15 - 29 = 62 - 20 - 30 = 18 - 10 - 6 = 79 + 8 - 51 = 40 + 30 - 42 = 31 + 65 - 32 = 73 + 24 - 52 = 24 + 54 + 17 = 45 + 17 - 25 = 29 - 11 - 16 = 82 - 6 + 23 = 23 + 42 - 29 = 86 - 13 - 6 = 9 + 53 + 34 = 31 + 26 - 57 = 8 + 81 + 8 = 33 - 9 - 14 = 78 + 11 + 6 = 共计：80 题做对：计时：成绩：1385 + 10 - 56 = 13 - 6 - 6 = 57 + 39 + 1 = 67 + 8 + 11 = 10 - 9 + 31 = 11 - 9 + 31 = 61 + 34 + 5 = 79 - 20 + 38 = 55 - 22 - 18 = 30 - 23 + 11 = 33 - 14 + 80 = 79 + 17 - 9 = 91 + 6 - 16 = 50 - 34 + 42 = 34 - 26 + 75 = 17 - 16 + 95 = 27 - 18 - 7 = 15 + 69 - 71 = 40 + 11 - 6 = 19 - 16 - 3 = 30 + 37 + 30 = 40 - 33 - 6 = 49 + 7 - 8 = 67 + 32 - 93 = 30 + 24 - 17 = 46 - 35 + 19 = 56 + 20 - 28 = 38 + 18 - 13 = 24 + 31 - 22 = 14 - 9 - 1 = 55 - 6 + 37 = 52 - 9 - 41 = 39 + 39 + 12 = 78 + 17 + 4 = 78 - 47 - 14 = 78 + 17 - 67 = 66 + 7 + 12 = 57 - 11 + 51 = 64 + 36 - 6 = 56 - 42 - 7 = 21 + 8 - 7 = 72 + 21 - 66 = 48 + 16 - 26 = 54 + 20 - 55 = 59 + 38 - 46 = 44 + 54 - 66 = 84 + 9 - 13 = 17 + 37 - 36 = 11 + 35 - 44 = 46 - 24 + 38 = 49 + 12 - 27 = 54 - 36 + 63 = 72 - 71 + 94 = 46 + 31 - 61 = 79 + 15 + 4 = 37 + 59 + 2 = 61 - 47 - 10 = 51 + 47 + 2 = 61 - 59 + 55 = 74 + 14 - 48 = 75 - 52 + 15 = 63 - 13 + 47 = 59 - 20 - 27 = 73 + 26 + 1 = 57 + 31 - 15 = 39 - 8 - 11 = 67 + 7 - 62 = 66 - 35 + 66 = 70 + 23 - 36 = 59 - 21 + 19 = 56 + 10 - 26 = 14 + 33 - 44 = 65 + 28 + 7 = 22 - 8 - 10 = 73 + 19 - 8 = 75 + 17 + 7 = 40 - 13 + 47 = 93 + 7 - 40 = 74 + 19 - 17 = 30 - 9 - 11 = 共计：80 题做对：计时：成绩：1458 - 40 - 16 = 80 + 10 + 10 = 18 - 12 - 4 = 16 + 27 - 11 = 55 - 20 + 44 = 41 - 37 - 3 = 25 + 23 + 14 = 45 - 24 - 7 = 62 + 37 + 1 = 92 - 28 - 21 = 70 + 20 + 6 = 80 + 9 - 77 = 10 + 72 - 66 = 86 - 69 - 17 = 91 - 82 + 50 = 28 - 10 - 7 = 46 - 9 + 10 = 61 + 22 - 25 = 53 + 36 - 57 = 46 + 20 - 45 = 33 - 13 - 19 = 69 - 68 - 1 = 73 - 32 + 58 = 58 + 29 - 19 = 75 - 63 + 78 = 58 - 53 + 21 = 91 + 6 - 64 = 49 + 39 - 78 = 92 - 35 + 34 = 93 + 6 - 51 = 72 - 49 - 10 = 45 - 11 - 17 = 49 + 40 - 78 = 59 + 13 - 48 = 30 - 27 - 1 = 10 + 12 - 18 = 27 + 62 - 50 = 93 - 37 + 23 = 85 - 23 - 59 = 73 + 22 - 69 = 9 - 6 - 3 = 71 + 20 - 51 = 54 - 21 + 19 = 49 - 22 - 25 = 55 + 33 - 68 = 64 + 7 + 27 = 32 + 32 + 21 = 24 - 14 - 10 = 59 - 6 + 33 = 64 - 37 + 59 = 20 + 66 + 10 = 11 - 6 + 13 = 39 - 28 - 11 = 16 - 11 + 78 = 78 + 21 - 36 = 37 - 26 + 11 = 9 - 6 - 3 = 21 - 19 - 1 = 53 + 14 + 9 = 31 - 24 - 7 = 79 + 6 - 38 = 77 + 20 - 14 = 76 - 28 - 36 = 49 + 34 - 19 = 29 - 15 - 14 = 42 - 29 + 85 = 90 - 79 - 11 = 35 - 25 - 10 = 17 - 10 - 6 = 76 - 59 + 77 = 55 - 38 - 8 = 8 + 69 + 23 = 16 - 12 - 4 = 50 - 22 - 15 = 69 - 13 + 34 = 51 + 19 - 62 = 20 - 8 - 9 = 59 + 29 - 7 = 81 - 10 + 14 = 37 + 46 + 9 = 共计：80 题做对：计时：成绩：1548 - 24 + 33 = 34 - 9 + 68 = 12 + 72 - 68 = 16 - 7 - 8 = 57 - 55 + 55 = 44 - 40 - 3 = 55 - 17 - 6 = 24 + 22 + 33 = 21 - 8 + 29 = 74 - 61 + 83 = 91 + 6 + 3 = 55 + 33 - 14 = 48 - 33 + 37 = 44 + 20 - 41 = 51 - 51 + 68 = 77 + 17 - 20 = 80 - 19 - 57 = 19 + 7 - 26 = 61 - 55 + 47 = 92 + 7 - 98 = 69 - 25 + 45 = 50 + 13 - 27 = 18 - 6 + 78 = 40 - 20 + 40 = 29 - 18 + 86 = 43 + 47 - 90 = 67 + 31 - 45 = 38 - 16 - 7 = 42 + 47 + 10 = 84 - 43 + 41 = 14 - 11 + 96 = 9 + 31 - 25 = 69 + 25 - 60 = 62 - 49 - 6 = 86 + 10 + 1 = 43 - 15 + 71 = 92 + 6 + 1 = 77 + 6 - 72 = 91 - 58 - 7 = 42 + 38 - 65 = 30 + 44 - 74 = 29 - 24 - 3 = 13 + 9 + 40 = 90 + 6 - 92 = 77 + 14 + 6 = 10 + 35 - 21 = 83 - 77 - 2 = 34 + 53 + 6 = 53 + 16 - 33 = 19 - 12 - 7 = 60 - 22 + 44 = 59 + 34 + 6 = 48 + 15 - 26 = 26 - 23 + 67 = 41 - 23 - 14 =47 + 21 - 10 = 8 + 67 + 22 = 18 - 15 + 94 = 58 - 34 - 21 = 55 + 41 - 76 =48 + 48 + 4 = 47 - 42 - 1 = 66 - 50 + 29 = 83 + 11 + 6 = 17 + 59 - 54 = 54 + 31 - 7 = 82 + 10 - 49 = 63 + 26 - 71 = 9 - 8 - 1 = 32 - 31 + 43 = 59 + 17 + 23 = 14 - 8 + 63 = 37 + 46 - 65 = 20 - 6 - 14 = 28 - 14 + 46 = 9 - 8 - 1 = 89 + 11 - 97 = 54 + 7 + 19 = 71 + 13 + 8 = 79 + 18 - 68 = 共计：80 题做对：计时：成绩：1658 + 18 - 39 = 13 + 15 + 53 = 75 - 62 + 19 = 80 + 9 + 8 = 63 + 8 - 24 = 49 - 17 - 27 = 82 + 13 + 4 = 90 - 53 - 21 = 82 - 28 + 16 = 57 + 32 - 79 = 78 + 7 + 14 = 44 + 31 + 8 = 66 + 16 + 12 = 87 + 8 - 14 = 38 + 20 - 9 = 8 - 7 + 18 = 33 - 21 + 85 = 82 + 17 + 1 = 11 - 8 + 63 = 56 + 6 + 21 = 88 + 6 + 3 = 9 - 7 + 69 = 49 - 36 - 7 = 62 - 37 + 28 = 43 - 17 - 26 = 57 + 26 - 54 = 31 + 6 + 36 = 40 + 55 - 60 = 60 + 8 - 10 = 10 - 7 - 1 = 26 - 20 + 52 = 13 + 84 + 3 = 78 - 32 + 48 = 57 - 33 + 74 = 53 + 39 - 57 = 42 - 9 + 45 = 75 - 59 + 29 = 77 + 10 + 8 = 42 + 40 + 9 = 87 + 13 - 59 = 25 - 7 - 13 = 91 + 9 - 53 = 54 - 38 - 8 = 61 + 21 - 79 = 46 + 52 + 1 = 9 - 6 + 95 = 60 - 24 - 35 = 65 - 43 + 31 = 75 - 47 - 27 = 27 - 12 - 11 = 23 + 6 - 22 = 48 - 39 + 76 = 65 - 42 - 23 = 24 + 37 + 14 = 90 - 75 + 81 = 31 + 66 - 50 = 55 - 20 + 25 = 66 + 21 - 85 = 39 + 47 - 28 = 70 + 26 + 2 = 52 + 29 + 8 = 84 - 40 - 35 = 49 - 40 - 6 = 29 + 65 - 11 = 81 - 10 + 10 = 67 - 13 + 38 = 38 + 26 + 7 = 16 - 7 - 8 = 13 + 60 + 9 = 56 - 10 + 24 = 46 + 26 + 20 = 74 + 8 + 16 = 34 + 17 - 12 = 9 - 6 + 41 = 90 - 32 + 35 = 88 - 41 + 35 = 71 + 9 - 60 = 8 + 58 + 29 = 19 - 6 - 12 = 28 - 18 - 7 = 共计：80 题做对：计时：成绩：1761 - 40 + 14 = 15 + 55 + 18 = 70 + 29 - 36 = 60 + 28 - 49 = 76 - 64 + 28 = 90 + 8 - 70 = 81 + 12 - 22 = 85 - 12 - 10 = 67 - 66 - 1 = 72 + 11 - 22 = 65 - 56 - 7 = 73 + 13 + 11 = 15 + 83 + 1 = 36 - 6 + 28 = 8 + 13 - 18 = 75 + 18 - 35 = 16 + 54 + 22 = 65 - 15 - 37 = 40 - 27 + 28 = 52 + 26 + 16 = 42 + 24 + 31 = 17 + 49 + 14 = 74 + 9 + 11 = 81 - 65 + 83 = 16 - 9 - 6 = 65 + 34 - 30 = 53 + 27 - 33 = 93 - 55 - 36 = 53 - 11 - 23 = 36 - 29 + 86 = 9 + 87 - 29 = 23 - 14 + 29 = 8 + 72 - 20 = 55 - 12 + 19 = 86 - 68 - 12 = 82 - 13 - 26 = 24 - 10 + 64 = 21 + 66 + 13 = 45 + 47 + 8 = 86 + 11 + 2 = 40 - 11 - 14 = 33 - 21 + 50 = 78 - 18 + 15 = 88 + 7 - 82 = 72 - 64 - 7 = 84 - 61 - 13 = 15 + 35 + 33 = 55 - 26 + 55 = 17 - 13 + 6 = 65 - 47 + 45 = 34 - 11 + 28 = 16 - 8 + 58 = 85 + 10 + 2 = 89 + 9 + 2 = 65 - 13 + 26 = 77 + 13 - 71 = 17 + 59 - 26 = 32 - 12 + 57 = 73 - 42 + 26 = 92 + 6 - 93 = 17 - 7 - 7 = 22 - 20 - 2 = 59 - 54 - 4 = 16 - 10 + 24 = 66 + 32 + 2 = 86 + 7 + 6 = 58 - 22 - 26 = 24 + 37 - 36 = 53 + 8 - 35 = 8 + 29 - 9 = 70 - 13 - 28 = 26 + 34 - 38 = 71 + 28 - 51 = 39 - 36 + 37 = 82 - 21 + 18 = 25 + 9 - 7 = 20 + 51 + 6 = 93 - 61 - 21 = 56 - 33 - 20 = 42 + 15 - 34 = 共计：80 题做对：计时：成绩：1817 + 26 + 44 = 84 + 7 + 6 = 21 + 45 - 13 = 19 - 18 + 98 = 68 - 40 + 55 = 65 + 16 - 76 = 28 - 11 - 16 = 61 - 25 + 24 = 64 + 29 - 15 = 38 - 14 - 7 = 36 + 55 - 19 = 81 - 30 + 22 = 62 - 48 - 14 = 87 - 10 + 23 = 17 + 15 - 23 = 51 + 13 + 35 = 42 + 12 - 52 = 77 - 14 - 60 = 63 - 27 + 11 = 72 + 12 - 24 = 72 + 6 + 9 = 55 + 35 - 88 = 92 + 6 - 66 = 67 + 23 - 29 = 16 + 83 + 1 = 86 + 7 + 6 = 24 + 35 + 31 = 39 + 39 + 11 = 12 - 10 + 47 = 93 + 7 - 98 = 34 + 35 - 18 = 32 - 17 + 39 = 73 + 14 - 6 = 76 - 73 + 66 = 27 - 26 + 86 = 13 + 82 + 2 = 84 - 41 - 31 = 30 - 25 + 92 = 87 - 27 - 52 = 48 - 26 - 22 = 88 - 47 + 50 = 29 + 27 - 12 = 64 + 26 - 30 = 73 - 17 - 13 = 67 - 30 + 14 = 11 - 9 - 1 = 46 + 49 - 82 = 28 - 10 - 6 = 24 - 7 - 13 = 31 - 28 - 3 = 77 + 12 - 29 = 70 - 15 + 25 = 58 + 8 + 25 = 57 - 25 - 32 = 35 + 51 - 40 = 24 + 30 + 21 = 69 - 43 - 21 = 21 + 11 + 38 = 76 + 9 + 10 = 72 - 24 - 41 = 75 + 16 + 6 = 84 - 80 - 4 = 66 + 18 + 6 = 42 - 12 + 66 = 42 + 28 + 30 = 61 + 7 - 24 = 44 - 18 - 26 = 27 + 50 - 46 = 54 + 9 + 33 = 36 + 35 + 11 = 61 - 47 - 12 = 24 - 15 + 48 = 65 + 28 + 6 = 26 + 63 - 87 = 38 + 54 - 60 = 8 + 50 + 20 = 67 + 28 + 1 = 17 + 25 + 25 = 83 - 8 + 17 = 48 - 46 + 53 = 共计：80 题做对：计时：成绩：1973 + 11 - 67 = 63 - 59 - 4 = 79 + 11 + 7 = 54 - 25 - 14 = 24 + 47 - 50 = 64 + 21 - 11 = 37 + 8 + 42 = 21 + 51 + 9 = 87 - 50 - 31 = 78 - 29 + 30 = 24 - 15 - 9 = 15 - 9 - 1 = 23 + 67 + 6 = 42 + 20 - 44 = 70 + 22 + 6 = 85 - 50 + 26 = 15 + 13 - 12 = 91 - 18 - 43 = 37 + 14 - 31 = 70 + 14 + 11 = 40 - 12 + 33 = 88 - 68 + 53 = 33 + 38 + 24 = 19 + 28 + 41 = 51 + 31 + 8 = 48 - 25 + 41 = 45 - 20 + 47 = 44 + 20 - 13 = 40 + 29 + 26 = 87 + 10 + 3 = 71 + 19 - 37 = 75 - 73 - 1 = 27 - 13 + 20 = 27 + 8 - 11 = 79 + 20 - 36 = 77 + 21 - 30 = 91 - 70 + 28 = 9 - 6 - 3 = 91 - 86 - 2 = 13 - 9 - 1 = 21 + 68 + 9 = 23 + 13 + 52 = 51 - 47 - 4 = 50 + 16 - 23 = 76 + 19 + 5 = 17 - 9 + 19 = 83 + 11 + 6 = 9 - 6 + 83 = 10 + 49 + 41 = 85 - 32 - 7 = 52 - 17 - 23 = 9 - 7 - 1 = 87 - 27 - 25 = 19 + 24 + 54 = 33 + 40 - 26 = 65 + 11 - 16 = 37 + 28 + 21 = 63 - 39 + 17 = 73 + 24 + 1 = 22 + 23 + 23 = 38 + 33 - 24 = 93 + 7 - 15 = 33 - 21 - 9 = 50 + 14 - 26 = 54 - 12 - 42 = 18 + 80 + 1 = 87 + 8 - 92 = 45 + 53 + 2 = 65 - 23 - 24 = 16 - 8 + 56 = 79 + 7 + 7 = 73 + 13 + 6 = 24 - 6 + 56 = 19 - 17 - 2 = 65 + 11 + 15 = 91 + 7 - 29 = 79 + 16 + 4 = 60 - 7 - 28 = 60 + 37 - 50 = 80 - 70 + 57 = 共计：80 题做对：计时：成绩：2076 - 73 + 44 = 44 + 29 + 15 = 58 + 14 + 21 = 54 - 26 - 20 = 84 + 15 + 1 = 87 + 12 + 1 = 51 - 11 - 16 = 70 - 36 - 18 = 86 + 13 - 75 = 84 + 14 - 22 = 26 + 66 - 11 = 87 + 10 - 36 = 11 - 9 + 16 = 69 + 24 + 7 = 37 + 42 - 60 = 20 - 19 + 31 = 91 - 17 - 21 = 82 + 16 - 73 = 71 - 50 + 15 = 89 - 23 + 13 = 56 - 37 - 19 = 45 + 27 - 60 = 89 - 78 + 56 = 84 - 6 - 14 = 28 + 27 - 46 = 74 - 69 - 2 = 23 + 9 - 25 = 25 + 59 - 31 = 88 + 9 + 3 = 62 - 32 + 43 = 65 - 33 - 22 = 74 - 32 - 12 = 90 - 49 - 14 = 40 + 15 - 23 = 13 - 11 + 51 = 63 + 17 - 76 = 50 + 42 + 8 = 47 - 29 + 22 = 53 + 34 - 85 = 80 + 18 + 1 = 20 + 28 - 17 = 41 + 44 - 29 = 88 - 22 - 37 = 62 + 25 + 8 = 58 - 22 - 30 = 93 - 60 + 41 = 55 + 13 - 60 = 60 - 54 - 1 = 56 - 30 + 16 = 22 + 42 - 45 = 85 - 15 - 28 = 23 - 17 - 6 = 69 - 12 - 20 = 11 - 7 - 2 = 57 + 6 - 6 = 37 + 41 + 22 = 76 + 13 + 8 = 92 - 57 - 19 = 71 + 8 + 9 = 79 - 72 - 6 = 23 - 20 - 2 = 61 - 36 - 11 = 14 - 6 - 8 = 91 - 26 - 9 = 15 - 11 - 4 = 54 + 19 - 26 = 9 + 53 + 29 = 76 + 18 - 32 = 18 - 14 + 60 = 10 + 28 - 18 = 11 - 8 + 60 = 81 - 38 + 31 = 74 - 59 - 9 = 83 + 6 - 8 = 82 - 38 + 27 = 45 - 10 + 38 = 44 + 48 - 60 = 80 + 12 - 84 = 59 - 49 - 6 = 52 - 23 + 34 = 共计：80 题做对：计时：成绩：2137 - 9 + 63 = 50 - 10 - 24 = 55 - 45 + 65 = 9 - 7 - 2 = 59 + 21 + 11 = 16 - 14 + 97 = 59 + 10 - 51 = 11 + 49 + 13 = 8 - 6 - 1 = 24 + 44 + 15 = 25 - 10 - 12 = 44 + 14 + 9 = 48 + 19 + 9 = 55 + 45 - 80 = 90 - 78 - 10 = 66 - 65 - 1 = 24 + 69 + 6 = 24 + 46 - 55 = 9 + 88 - 93 = 72 - 45 - 27 = 44 - 7 - 6 = 72 - 67 - 5 = 34 + 41 + 23 = 33 + 55 + 11 = 85 - 50 - 20 = 55 + 6 + 31 = 36 - 6 - 14 = 76 - 60 + 28 = 29 - 22 + 46 = 23 - 7 + 66 = 90 - 80 + 73 = 13 - 8 + 31 = 58 - 6 + 7 = 68 - 68 + 77 = 51 - 40 - 8 = 57 - 53 - 3 = 12 + 28 - 22 = 66 - 21 + 38 = 42 + 54 + 1 = 31 + 61 + 7 = 89 + 7 - 45 = 25 - 18 - 7 = 81 - 67 - 12 = 32 + 23 + 26 = 54 - 21 + 22 = 78 + 8 + 8 = 79 + 14 - 86 = 14 + 25 + 27 = 20 - 14 + 40 = 74 + 21 - 17 = 11 + 47 - 12 = 79 - 23 - 37 = 75 - 42 - 24 = 80 - 43 - 27 = 83 + 11 - 57 = 30 - 6 + 22 = 70 - 58 - 8 = 18 + 51 - 14 = 73 + 14 - 58 = 19 - 13 - 4 = 70 - 30 + 12 = 54 - 32 + 64 = 39 + 29 + 22 = 15 - 7 + 8 = 33 - 21 + 82 = 54 + 6 + 6 = 13 + 7 - 9 = 8 - 7 + 72 = 65 - 59 - 3 = 75 + 8 + 6 = 11 + 35 - 46 = 69 - 11 - 43 = 68 - 45 + 41 = 75 - 13 - 25 = 43 + 16 - 30 = 75 + 11 + 10 = 87 - 77 + 90 = 90 - 51 + 9 = 69 + 20 + 9 = 56 - 13 - 25 = 共计：80 题做对：计时：成绩：2224 - 24 + 21 = 80 - 17 + 8 = 77 + 6 + 14 = 39 + 20 - 15 = 44 - 41 - 1 = 27 - 20 + 81 = 88 - 47 - 8 = 60 - 58 + 41 = 52 + 10 + 33 = 65 + 9 + 15 = 20 + 79 - 93 = 33 + 24 + 25 = 88 - 13 - 38 = 17 + 29 - 42 = 75 - 74 + 96 = 85 - 9 + 23 = 80 + 14 - 66 = 68 + 28 - 59 = 79 - 70 - 8 = 36 + 58 + 2 = 17 - 14 + 94 = 69 - 10 - 14 = 53 + 22 - 38 = 85 - 35 - 9 = 68 - 35 + 18 = 17 - 11 + 87 = 69 + 22 - 42 = 67 - 7 + 33 = 13 + 77 - 70 = 91 - 30 - 46 = 22 + 68 + 9 = 69 - 26 + 40 = 51 - 38 + 27 = 72 + 20 + 6 = 65 + 31 - 82 = 18 - 13 + 20 = 77 + 7 + 16 = 72 - 60 + 77 = 51 + 32 + 11 = 81 + 18 + 1 = 30 - 10 - 14 = 17 - 9 + 79 = 86 - 78 + 59 = 56 + 42 + 1 = 47 - 12 + 55 = 36 - 23 - 8 = 58 + 13 + 17 = 55 - 17 - 35 = 9 + 43 + 28 = 52 + 19 - 68 = 65 + 16 + 12 = 80 - 69 - 11 = 61 - 42 + 19 = 42 + 12 + 12 = 36 + 31 + 14 = 33 + 65 - 97 = 20 - 20 + 81 = 41 + 58 - 30 = 13 - 11 - 2 = 28 + 64 - 73 = 71 + 28 - 56 = 64 + 13 + 21 = 86 - 20 - 38 = 67 + 27 - 9 = 39 + 47 - 38 = 22 - 13 - 7 = 73 - 28 - 6 = 59 + 23 + 9 = 81 - 55 + 19 = 30 - 20 - 7 = 47 - 23 - 11 = 71 + 23 + 2 = 18 + 6 - 12 = 10 - 7 - 2 = 46 - 37 - 8 = 81 + 6 + 9 = 80 - 21 + 20 = 19 + 33 - 17 = 74 + 8 + 12 = 43 - 19 - 20 = 共计：80 题做对：计时：成绩：2391 + 8 - 70 = 67 - 46 + 27 = 34 - 20 + 64 = 69 + 23 + 8 = 58 - 19 + 58 = 19 - 13 - 6 = 93 + 6 - 83 = 60 - 59 - 1 = 24 + 21 + 33 = 16 - 14 + 73 = 42 - 24 - 16 = 12 - 8 + 35 = 43 + 12 - 41 = 36 + 62 - 64 = 31 - 25 - 5 = 50 + 7 + 17 = 67 + 16 - 42 = 75 + 22 - 49 = 80 - 80 + 81 = 27 - 26 + 36 = 84 - 29 - 18 = 83 - 51 - 31 = 32 + 57 + 9 = 77 + 13 - 45 = 85 - 39 + 33 = 8 + 91 + 1 = 58 - 32 - 12 = 90 - 18 - 71 = 92 + 6 - 47 = 77 + 18 + 1 = 52 - 9 + 10 = 80 + 7 + 9 = 84 - 8 + 11 = 45 - 14 + 9 = 88 - 75 + 38 = 46 - 21 - 21 = 81 + 15 - 23 = 71 - 44 - 8 = 93 - 30 + 14 = 68 + 21 + 6 = 72 - 6 + 26 = 69 + 9 + 6 = 76 + 16 + 8 = 80 + 16 - 25 = 74 + 7 - 20 = 43 - 28 - 6 = 80 - 54 - 8 = 24 + 14 + 58 = 42 - 21 + 75 = 10 + 35 - 26 = 48 - 8 + 8 = 85 - 65 - 8 = 29 + 31 + 39 = 25 - 18 - 6 = 34 + 18 - 49 = 16 + 54 + 25 = 42 + 36 - 18 = 89 + 9 + 1 = 51 - 18 - 11 = 20 - 19 + 50 = 55 - 47 + 31 = 83 - 8 - 41 = 41 - 27 + 60 = 9 + 88 + 1 = 24 + 33 - 20 = 85 - 15 + 10 = 77 + 13 + 9 = 18 + 16 - 17 = 48 + 42 - 56 = 74 + 17 - 58 = 23 - 12 + 6 = 61 - 7 - 42 = 70 - 46 - 24 = 67 - 61 + 75 = 60 - 15 + 24 = 81 + 6 + 12 = 49 + 35 - 44 = 10 + 82 - 91 = 45 + 19 + 7 = 74 - 60 - 9 = 共计：80 题做对：计时：成绩：24。

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小学一年级数学《加减混合运算》教学案例
教学内容：一年级上册教科书第68、69页。

教学目标：1让学生联系生活情境，理解加减混合的含义和计算顺序，能正确地进行口算。

2、发展学生初步的计算能力、语言表达能力和思维能力。

3、培养学生认真倾听和认真书写的习惯。

4让学生在解决问题的过程中，体会数学与生活的联系，培养数学应用意识。

教学重点：让学生掌握正确的计算方法和培养学生看、听、说、写等良好学习习惯。

教学难点：让学生理解加减混合的含义和计算顺序。

教具、学具准备：多媒体课件、小木棒、口算卡片。

教学过程：
一、创设情境，激发兴趣。

同学们，你们喜欢听儿歌吗？（喜欢）好，我们一起来听一首《数鸭子》的儿歌吧，播放儿歌，好听吗？你们听到了那些数学数字呀？（1、2、3、4、6、7、8）你们真厉害！
你们能用这些数字组成连加连减的算式吗？（能）
生1: 1+2+3=6、6-3-2=1
生2：1+2+4=7、7-1-2=4
生3：1+3+4=8 、8-4-3=1
你们知道是怎么算的吗？
生：都是先算前面的再算后面的。

二、主动探索，体会领悟。

1、提出问题。

多媒体出示例题图：车上有7人，先下车2人，接着上3人。

提问:
从刚才的画面中，你们看到了什么？先在小组里说一说。

（学生在小组内交流）
谁愿意在班上说一说？指名说，真棒!
你们能把刚才看到的列成算式吗？学生列算式：7-2+3
（板书：7-2+3）
（4）哪位同学试着读读看？（7减2再加3）
老师领读，学生齐读，同桌互读。

2、揭示课题。

这道题跟我们前面学习的连加、连减有什么不同?
指出：像这样有加又有减的算式，叫加减混合，这就是我们今天要学习的内容。

（板书：加减混合）
3、探究算法。

（1）怎么算呢？能摆一摆你们的小木棒吗/?请同学们一边摆一边说。

（2）摆完小木棒，你们知道怎么算了吗？先算什么？再算什么？
板书：7-2+3=8
—
5
指名再说说计算过程，同桌互相说说。

（先算7-2=5，再算5+3=8，所以7-2+3=8）
小结。

像“7-2+3”这样有加又有减的加减混合题，计算方法与连加连减一样：都是先算前面的，再算后面的。

（板书：先算前面的，再算后面的）
三、巩固深化，应用拓展
1、表演
（1）你们愿意把刚才看到的上下车情境演一演吗?指名表演。

（2）谁愿意把刚才看到的表演说一说？指名说：车上原来有7人，先下车2人，又上车3人，现在车上还剩8人。

（3）请同学们把刚才看到的听到的列出算式。

学生列式计算：7-2+3=8，再说出计算过程。

2、老师也来说一道题，你们一边听一边写出算式，看谁听得最认真：树上原来有5只小鸟，飞来了4只，又飞走了2只，现在树上还有几只？学生列式计算：5+4-2=7
3、谁也想来说一道？先后让几位学生说说，其他的边听边列式计算，并指名说说计算过程。

4、第1、2题。

指导学生认真观察图画，帮助学生弄清题意，列出算式，再说出计算过程。

5、听算。

（8道）
（1）老师说出算式，学生边听边写边算。

（2）集体校对。

6、看算。

（10道）
老师出示口算题，学生伸出十指，边看边说边屈手指算。

7、唱儿歌。

现在我们来休息一会，唱一首《找朋友》的儿歌，好吗？（好）
8、做游戏。

（第4题）
除了喜欢唱歌，你们还喜欢做游戏吗？好，现在我们就来做一个《找朋友》的游戏，游戏也是要通过认真计算才能找到好朋友的哦，准备好了吗？请拿出你们手中的小卡片，（答案）老师手中有你们的好朋友，（题目）看谁找得又对又快。

同学们都找到了好朋友，高兴吗？
9、第6题。

比一比，看谁写得最端正，算得最认真。

四、作业。

第3题：比一比，看谁写得又快又对。

五、课堂总结。

今天这节课你们学到了什么本领？你们学得开心吗？
六、板书设计：板书：加减混合运算
7-2+3=8
—先算前面的
5 再算后面的。